As with comparative adjectives, there are two ways to form a superlative adjective: short adjectives: add "-est" long adjectives: use "most" We also usually add 'the' at the beginning. Short adjectives 1-syllable adjectives old, fast 2-syllable adjectives ending in -y happy, easy Normal rule: add "-est" old → the oldest Variation: if the adjective ends in -e, just add -st late → the latest Variation: if the adjective ends in consonant, vowel, consonant, double the last consonant big → the biggest Variation: if the adjective ends in -y, change the y to i happy → the happiest Long adjectives 2-syllable adjectives not ending in -y modern, pleasant all adjectives of 3 or more syllables expensive, intellectual Normal rule: use "most" modern → the most modern expensive → the most expensive With some 2-syllable adjectives, we can use '-est' or 'most': quiet → the quietest/most quiet clever → the cleverest/most clever narrow → the narrowest/most narrow simple → the simplest/most simple Exception The following adjectives have irregular forms: good → the best bad → the worst far → the furthest Source: http://www.englishclub.com Good luck